[issue32932] better error message when __all__ contains non-str objects

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Agreed. Seems this was an oversight. Do you want to write a patch yourself or left it on to me?

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nosy: +serhiy.storchaka
stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32932>
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